tag(功能):加入按照房间名称加入的功能

apps/ScreenShareApi/src/main/kotlin/Routing.kt

@@ -105,6 +105,7 @@ fun Application.configureRouting() {
                 val user = call.requireCurrentUser()
                 val title = call.receive<CreateRoomRequest>().title.trim()
                 if (title.length !in 1..128) throw ApiException("房间标题必须为 1-128 个字符", 400)
+                if (RoomRepository.findByTitle(title) != null) throw ApiException("该房间标题已存在", 409)
                 call.respond(HttpStatusCode.Created, RoomResponse(RoomRepository.create(user.id, title), RoomRole.host))
             }
 
@@ -121,6 +122,15 @@ fun Application.configureRouting() {
                 call.respond(RoomMemberResponse(RoomRepository.joinAsViewer(call.roomId(), user.id)))
             }
 
+            post("/api/rooms/join-by-title") {
+                val user = call.requireCurrentUser()
+                val title = call.receive<FindRoomByTitleRequest>().title.trim()
+                if (title.isEmpty()) throw ApiException("请输入房间标题", 400)
+                val room = RoomRepository.findByTitle(title) ?: throw ApiException("未找到该房间", 404)
+                val membership = RoomRepository.joinAsViewer(room.id, user.id)
+                call.respond(RoomResponse(room, membership.role))
+            }
+
             post("/api/rooms/{roomId}/members/{userId}/role") {
                 val requester = call.requireCurrentUser()
                 val roomId = call.roomId()
@@ -214,6 +224,7 @@ enum class RoomRole { host, publisher, viewer }
 @Serializable data class RegisterRequest(val inviteCode: String, val username: String, val password: String, val displayName: String)
 @Serializable data class CreateInvitationRequest(val type: String, val expiresInHours: Int = 168)
 @Serializable data class CreateRoomRequest(val title: String)
+@Serializable data class FindRoomByTitleRequest(val title: String)
 @Serializable data class UpdateMemberRoleRequest(val role: String)
 @Serializable data class AuthResponse(val token: String, val user: UserResponse)
 @Serializable data class UserResponse(val id: String, val username: String, val displayName: String, val isAdmin: Boolean) {